SCADA Point-to-Point Multiplexer TABLE OF CONTENTS SECTION 1 - DESCRIPTION...2 SECTION 2 - SPECIFICATIONS... SECTION - INSTALLATION... SECTION - CONTROLS AND INDICATORS...9 SECTION - NETWORK MANAGEMENT PORT... 11 SECTION 6 - INTERFACE SIGNALS AND CABLING... 1 SECTION - TROUBLESHOOTING... 22 SECTION - WARRANTY... 2 Data Comm for Business, Inc. PO Box 629 Champaign, IL 6126-629 September 1, 200 (21) 9-6600 Firmware Version: 1. www.dcbnet.com 00091
1. DESCRIPTION The DCB SR series statistical multiplexers are used in pairs to allow asynchronous RS-22 devices to communicate through a single composite (network) data link. The network may be synchronous or asynchronous, using leased lines or digital data service. Asynchronous terminal devices may be terminals, RTUs, computer ports, etc. Each data port is configured individually at speeds up to,600 bps. Network speeds may be as high as 11.2 Kbps asynchonous or 12 Kbps synchronous. The multiplexer is configured using a network management port or port one of any unit using an asynchronous terminal or PC with terminal emulation software. Multiplexer configurations are kept in non-volatile memory. Some features of the SR SCADA Multiplexer include: Monitor functions allow network management port user to monitor transmit or receive of any data port. Many test features allow diagnostics of the system and communications link. Power supplies available for 120 VAC, or 20 VAC. DC power options available. Built-in 6/6Kbps DSU/CSU option available. Built-in wireless modem option available. ( port unit only) Rack mount options available. TXD RXD RTS CTS DCD TEST SR DATA MULTIPLEXER ERROR READY SETUP LINE MODEM PORT 1 POWER ACTIVITY LOOPBACK LOOPBACK SETUP RESET DCB Network Network Switches DSU Telco Power Management Port Composite 2 1 Port SR Multiplexer shown with optional built-in DSU/CSU 2
2. SPECIFICATIONS 2.1 Data Ports Port Speeds Asynchronous only 00, 600, 1200, 200, 00, 9600, 19,200,,00 or,600 bps Port Rate Selection Selected per port through network management port control with an asynchronous terminal. Data Format 10 bits/character, 1 start, 1 stop, data (including parity) data bits plus parity available with optional firmware Interface CCITT V.2, RS-22D, implemented in RJ-, position connectors. (RS-61 standard physical pin-out used on RJ- connectors) Buffering 2K dynamically allocated 2.2 Composite Port Full Duplex Speed Synchronous up to 12 Kbps Asynchronous from 00 to 11,200 bps Interface RS-22D, implemented in RJ-, position connector 2. Physical / Electrical 10¼" W x 9¾" D x 2½" H 120 VAC external power supply Optional DC and 20VAC power supplies available 0 watts,.2 amps
2. Environmental Operation: -0 to +0 C, 10 to 9% relative humidity Storage: -0 to + C, 10 to 9% relative humidity 2. Network Management Port Commands Show Network Status Show Port Configuration Change Port Configuration Change Delay Timeout Configure Network Configure Modem Show / Change ID Set Password Activity Counters Zero Activity Counters Test Tools Monitor Port Tx Monitor Port Rx NMP Parity Ping Remote Mux Reset Mux Type Repeat Last Command Disconnect NMP 2.6 Other Specifications Operating Modes Multiplexing Port Loopbacks Front Panel Indicators Power Activity Line Error Modem Ready Port 1 Setup Loopback Front Panel Switches Loopback Setup Reset 2. Optional Built-In DSU/CSU Specifications Compatible with Common Carrier digital signalling 6 or 6 Kbps
wire digital line. INSTALLATION.1 Unpacking Remove the SR multiplexer from the shipping container and examine it carefully for external damage. If shipping damage is apparent, notify the shipper immediately. The following accessories are included with all SR multiplexers: external power supply manual warranty, maintenance contract and repair information Modem to Composite cable (black) for connecting the SR to an external modem or DSU/CSU Network Management Port cable (green) for connecting the SR network management port to an asynchronous terminal or PC for configuration If your unit has the optional built-in DSU/CSU, a cable is included for connection to the phone line..2 Setup The composite port must be configured properly for the type of link used (Sync or Async). In addition, each data port must have the proper speed and parity settings. This is done using the network management port CN and CP commands (see Section ).. Using Leased Line Modems In this section, a reference to modem includes modems, digital radios or DSU/CSUs for leased line installations. Connect the modems to the phone line and power ON the modems. Confirm the presence of carrier at each modem. If carrier is not detected at both ends, recheck the option settings. If carrier is still not present, check the cable from the telephone line to the modem. If everything is correct and still no carrier call the manufacturer of the modem or contact the telephone company for assistance. Connect the SR composite port to the modem. A two foot RJ to DB-2 male cable connects the composite port of the SR (the RJ connector second from the left when viewed from the rear) to the data port of the modem (usually a DB-2 female connector). See Section 6 for cabling information.
Connect the multiplexers to power. Power and Modem Ready indicators on the front panel of the SR must be ON indicating the on-line condition. (See Section ).. Optional Built-In 6/6 Kbps DSU/CSU For the port unit, the optional DSU/CSU is configured using DIP switches accessable from the rear of the unit. See Section for a description and location of these switches. The default settings should be correct for most applications. For, 16, 2 or 2 port units, the DSU/CSU is configured using the CM command. See Section. For line driver applications over customer owned wire (6K only), set one unit for Master Clock and the other unit to Slave Clock.. Optional Built-In Wireless Modem ( port unit only) Your SR-0 multiplexer with internal wireless modem was configured at the factory to work in most applications. If changes are required to the modem settings, connect a terminal to the multiplexer network management port (See Section ) and follow the procedure below. User responses are shown in BOLD...1 Set Mux Composite To Match Modem Setup Rate AT YOUR COMMAND >> CN<Enter> CONFIGURE NETWORK ------------------------------- ASYNC MODEM 600 SYNC or ASYNC modem? [S/A] >> A<Enter> ASYNC rate? [9600 / 19200 / 00 / 600 / 11200] >> 19<Enter> ASYNC MODEM 19200 6
..2 Enter Modem Setup Mode AT YOUR COMMAND >> CM<Enter> *** CONFIGURE NETWORK MODEM - Type ESC ESC to stop *** WARNING: Network DCD is ON MAIN MENU Version.6 0-1-2000 Standard Hop Table Modem Serial Number 90-6 (0) Set Operation Mode (1) Set Baud Rate (2) Edit Call Book () Edit Radio Transmission Characteristics () Show Radio Statistics () Edit MultiPoint Parameters (6) TDMA Menu (Esc) Exit Setup Enter Choice Make the required changes following the menu prompts. See the DGR-11 manual for options. Type Esc Esc to exit. <Esc><Esc> *** END CONFIGURE MODEM.. Set Mux Composite To Match Modem Baud Rate AT YOUR COMMAND >> CN<Enter> CONFIGURE NETWORK ------------------------------- ASYNC MODEM 600 SYNC or ASYNC modem? [S/A] >> A<Enter> ASYNC rate? [9600 / 19200 / 00 / 600 / 11200] >> <Enter> AT YOUR COMMAND >>
.6 Cabling Cabling between the multiplexer and the computer ports or terminal devices is a common source of installation problems. The SR must have data from attached terminal devices or computer ports, as an input on Position 6 of the RJ connector. Data from the SR to any attached equipment will be transmitted on position of the RJ connector. See paragraph 6.1 for position location on the RJ connector. See Section 6 to determine the correct cables for your computer and terminal devices.. Parity Considerations SR multiplexers transfer all character bits whether it is data bits plus parity or data bits. The SR does not verify parity for each character transferred. Consequently, the parity setting of the devices at either end of an SR channel must match. Optional firmware is available to set data bits plus parity (Even, Odd, Mark or None) on a port-by-port basis.. Resetting Factory Defaults The factory default settings for the SR multiplexer ports are as follows: Data Ports: Loop Rate OFF 9600 No Busy Composite Port: Modem type Rate With Internal DSU/CSU ASYNC.6 Kbps SYNC only To reset the unit to factory defauls use the!r command from the network management port or perform the following steps using the front panel switches: 1. Depress and hold the SETUP switch while depressing the RESET switch. 2. Be sure to continue to hold the SETUP switch until the unit completes the reset and the lights return to normal.. All port settings should be at the factory defaults. Use the SC (Show Configuration) command to check the port settings.
. CONTROLS AND INDICATORS.1 Switches TXD RXD RTS CTS DCD TEST SR DATA MULTIPLEXER ERROR READY SETUP LINE MODEM PORT 1 POWER ACTIVITY LOOPBACK LOOPBACK SETUP RESET DCB.1.1 Front Panel Switches ( port unit shown with built-in DSU) Setup Maps the network management port commands to the terminal attached to data port 1. When Port 1 Setup is active, the indicator is on. Loopback Disabled. Reset Performs a hardware reset of the multiplexer..1.2 Optional Built-In DSU Switches ( port unit only) The DSU switches are located at the rear of the unit. Switch functions are shown in the following table: Switch Down Up 1 6K 6K (optional) 2 Slave Clock Master Clock Must Be Down RTS Normal RTS Forced ON Normal Local Loop ON 6 Not Used NOTE RTS mode (sw ) is active in 6Kbps mode only. In 6Kbps mode, RTS is forced on. Network Network Switches DSU Telco Power Management Port Composite 2 1 9
For normal operation with a telephone company line, set the DSU for SLAVE clock timing (switch position 2 DOWN). For in-house line driver applications (6K only), set the host DSU for MASTER timing (switch position 2 UP). The remote unit should remain set for Slave clock..2 Multiplexer Indicators POWER ON when the SR is connected to power. ACTIVITY OFF no data activity. ON data is being transmitted. LINE ERROR flashes when a speed or parity error is detected. MODEM READY ON Data Carrier Detect is present from the composite link device indicating an active composite link. OFF Data Carrier Detect is not present from the composite modem or DSU/CSU indicating a problem with the composite link. PORT 1 SETUP ON when the network management port functions have been mapped to data port 1 by depressing the front panel switch. To return these functions to the network management port, depress the front panel switch again. LOOPBACK Disabled. Optional DSU/CSU Indicators ( port unit only) TxD Flashing Data is being sent over the link. RxD Flashing Data is being received from the link. RTS ON OFF Forced on or high from the multiplexer. No RTS from the multiplexer. CTS Follows RTS CTS signal to the multiplexer. DCD TEST ON OFF ON Flashing Normal condition. No carrier signal received from the far end. Unit is in loopback (DIP switch UP) Telephone line in loopback. 10
. NETWORK MANAGEMENT PORT.1 Introduction The Network Management port (NMP) is used to configure the SR multiplexer for proper operation. This connection must be used to configure the SR composite and data ports. The NMP can also be used to configure remote SR ports after a link is established between the host and remote sites..2 Connections and Setup Connection to the NMP is made either through a port on the rear of the multiplexer or by using Port 1 Setup..2.1 Port 1 Setup The easiest way to access the NMP functions is by using a terminal connected to port 1 of the multiplexer. A switch located on the front panel performs this function. See paragraph.1.1 for information. This option cannot be used if a printer is connected to port 1..2.2 Dedicated Terminal or PC The NMP functions are also available through a port on the rear of the unit labeled Network Management Port. To connect a dedicated terminal to this port, use the green cable provided and the appropriate adapter for either a terminal or PC. Set the terminal device for 9600 bps, data bits, no parity, one stop bit and no flow control..2. Dedicated Modem For remote access to NMP functions, a dial-up modem may be connected to the Network Management Port. You must fix the DTE interface speed of the modem at 9600 bps, data bits, no parity and one stop bit. Refer to your modem manual for appropriate setup procedures. Use the appropriate cable from paragraph 6.. for connection. 11
. Using the Network Management port To activate the NMP, press the ENTER key. When you see AT YOUR COMMAND >>, the NMP is active and ready for your commands. Type H <Enter> to display the command set.. Commands..1 Help (H or?) COMMAND LOCAL REMOTE PARAGRAPH Show: Config SC RSC..2 Network SN.. Change: Port Config CP RCP.. Delay Timeout CD RCD.. Config Network CN..6 Config Modem CM.. Set ID ID RID.. Set Password PW..9 Activity Counters/Zero AC/Z RAC/RZ..10 Test Tools TT..1 Type TY RTY..11 Repeat Last Command *..12 Disconnect NMP BYE..1 This Help screen shows the choice of commands available. The commands allow you to display the selected options (Show network and configuration), configure the SR (Configure ports and Set ID), and perform many different diagnostic functions such as send a test message, monitor data, perform loopbacks, show flow control state, show activity and other useful tests...2 Show (Port) Configuration The Show Config (SC) command shows the current port configuration settings for either the local or the remote (RSC) ports. Port numbers may be included with this command to limit the display range. If no port numbers are included, settings for all ports are shown. Use this command to verify proper port configuration... Show Network (Configuration) The Show Network (SN) command displays the current network (composite port) configuration (SYNC or ASYNC). 12
NOTE Several commands allow port numbers or port number ranges to be included on the command line. When port numbers are included, the syntax is as follows: (Command)1 Port 1 (Command)1,2, Ports 1, 2 & (Command)1 Ports 1, & (Command)2 Ports 2 thru.. Change Port Configuration The Change Port Config (CP / RCP) command sets the data port loopback, rate and output flow control configuration for each data port. Follow the prompts and examples on the screen to select the port(s) and parameter(s) you wish to change. One or more ports may be set with a single command by selecting a range of port numbers. The factory default setting is loop off, no busy, 9600 bps. With optional firmware, this command is also used to set ports for data bits plus EVEN, ODD, MARK, or NO parity... Change Delay Timeout This command (CD) is used to change two timeout parameters, DCD to Rx data delay and DCD holdover delay. These delays may be adjusted to insure data block integrity...6 Configure Network The Configure Network command (CN) allows configuration of the multiplexer composite port for asynchronous or synchronous operation. If an internal DSU is installed, only synchronous operation is allowed. 1
.. Configure Modem The Configure Modem command (CM) establishes a direct connection between the network management port and the composite port. In the port unit, this command is used to configure the optional built-in wireless modem. See paragraph.. In the 2 port units, this command is used to configure the optional internal DSU/CSU. Type two consecutive ESC characters to return to the AT YOUR COMMAND >> prompt... Set ID The Set ID (ID / RID) command allows you to set or change either the local or remote multiplexer identifier. IDs can be a maximum of 1 characters in length. Pressing <Enter> with no entry will leave the ID unchanged...9 Set Password Use the Set Password (PW) command to set a password for access to the network management port. The password may be up to 1 characters long and is case sensitive. When password is active, the user is allowed three attempts and is then disconnected. To clear the password, type DELETE at the PW prompt or reset the unit to defaults as described in paragraph....10 Activity Counts / Zero The Activity Counts (AC / RAC) command shows transmit and receive data statistics for all ports. The data are presented in terms of blocks of information sent and received by the network and each data port. Error counts are also shown. A range of ports may be included with this command to reduce the number of ports shown. The Z and RZ commands are used to zero the counters so that current activity can be monitored. 1
..11 Type The Type (TY) command displays information about the local multiplexer including firmware version, number of ports and multiplexer ID. The Remote Type (RTY) command is used to display similar information about the remote multiplexer...12 Repeat Last Command To repeat the last command, simply press the * key. This is handy for repeating screens of constantly changing data...1 Disconnect NMP The BYE command toggles the CTS output from the Network Management port. This is used to disconnect equipment such as dial-up modems or the DCB Access Switch...1 Test Tools The Test Tools (TT) menu summarizes the test and troubleshooting commands. These commands are listed separately to reduce the clutter in the main help list, but are always available from the command prompt. COMMAND LOCAL REMOTE PARAGRAPH Monitor Port Tx MT#..1 Monitor Port Rx MR#..1 NMP Parity P..16 Ping Remote Mux PING..1 Reset MUX RESET RRESET..1..1 Monitor Port TX or RX The Monitor Port TX (MT#) command monitors data transmitted from the selected port to the corresponding port of the remote multiplexer. The Monitor Port RX (MR#) command monitors data received by the selected port from the corresponding port of the remote multiplexer. A local port number must be included on the command line. When port monitor is active, two ESC characters are used to end the test. 1
..16 NMP Parity The NMP Parity command (P) sets the parity for the network management port. The factory default is SPACE (,N,1)...1 Ping Remote Mux The PING command pings the remote multiplexer and displays the response time in milliseconds...1 Reset Mux The Reset Mux (RESET) command performs a local multiplexer reset. To reset the remote multiplexer use RRESET. 16
6. INTERFACE SIGNALS AND CABLING 6.1 Connector Location and Pin Reference Network Network Power Management Port Composite Switches 2 DSU Telco 1 1 2 6 SR Rear Panel and RJ- Jacks RJ- Plug Positions 1
6.2 Port Interface 6.2.1 Composite Port (RJ-) Pin Signal In/Out 1 Receive Clock IN 2 Transmit Clock IN Data Carrier Detect IN Signal Ground Transmit Data OUT 6 Receive Data IN Request to Send OUT Clear to Send IN 6.2.2 Data Ports (RJ-) Pin Signal In/Out 1 Data Set Ready OUT 2 Data Carrier Detect OUT Busy IN Signal Ground Receive Data OUT 6 Transmit Data IN Clear to Send OUT Request to Send IN 6.2. Network Management Port (RJ-) Pin Signal In/Out 1 Not Used 2 Not Used Data Terminal Ready IN Signal Ground Receive Data OUT 6 Transmit Data IN Clear to Send OUT Request to Send IN 6.2. Optional Built-In DSU Interface (RJ-S) Pin Signal In/Out 1 Transmit Data OUT 2 Transmit Data OUT Receive Data IN Receive Data IN 1
6. Cables 6..1 Composite Port to Modem A two foot composite to modem cable is included with each SR multiplexer. The configuration is as follows: SR RJ- 1 2 6 Modem DB-2P 1 1 2 20 6..2 Data Ports to Host Computer Configured as DTE SR RJ- Computer DB-2 1 2 6 6 20 2 (or other flow control output pin) (or other flow control input pin) (or 20 if is flow control) 19
6..2 Data Ports to Host Computer, continued Configured as DCE SR RJ- Computer DB-2 1 2 6 20 2 (or if 20 is flow control) (or other flow control output pin) (or other flow control input pin) To a PC Com Port SR Computer RJ- DB-2S DE-9S 1 2 6 6 or 6 or 1 or or or 2 2 or or 20 or 20
6.. Network Management Port To a TERMINAL NMP RJ- 6 Terminal DB-2P 20 2 6 To a PC using terminal emulation NMP Computer RJ- DE-9S DB-2S 6 or 20 or 2 or or 2 or 6 or 6 1 or or To a dial-up MODEM for remote access NMP RJ- 6 Modem DB-2P 2 20 21
. TROUBLESHOOTING.1 General Approach When troubleshooting problems, a rational plan can save you many hours of frustration. The following is a brief outline of standard troubleshooting procedures. 1. Gather the facts to determine the exact nature of the problem. 2. Draw a picture of the system showing the equipment at both the host and remote ends and the phone lines or in-house wiring. Use this as a reference to note your observations, test steps and test results. A picture keeps you focused and often saves duplicate effort.. Record the front panel indications before changing anything. This is an important part of fact gathering. If you change anything, change only one thing at a time.. Use the built-in test functions, especially the loopback tests and record your results..2 Loopback Tests It is best to begin loopback testing at the remote terminal and work toward the host. If all the loopbacks are successful, the data communications equipment and the terminal are working correctly. Put the remote multiplexer port in loopback and have someone type alpha characters on the keyboard of the affected terminal. If the characters appear correctly on the screen, the port is working. Next loop the associated port of the host multiplexer. If characters again appear correctly, the communications link and the ports on both multiplexers are working correctly. The problem then is with the host computer port or the cable between the host computer and the multiplexer. Port loopbacks can be turned on and off from the Network Management port of the multiplexer. If a NMP terminal is not available, port loopback can be enabled using the Port 1 Setup function of the remote multiplexer 22
. Installation Troubleshooting, Modems or DSUs First, set up the Modems or DSUs without connecting the multiplexers. If DSUs are used they should be set to constant carrier, also called forced Request To Send, or constant RTS. Carrier Detect should be ON at both locations.. Installation Troubleshooting, Multiplexers Before trying terminals, make sure the multiplexers are able to see each other. Use the RTY command to verify a response from the remote multiplexer. If you get a correct response to RTY, the link is up and the multiplexers are communicating.. Installation Troubleshooting, Terminals Terminal problems typically fall into four categories: 1. The terminal or printer gets no data 2. The terminal or printer gets garbage data. Blocks of data are lost. Terminals or printers seem to hang. When a terminal gets no data, check to see the cables are wired correctly and that flow control is set properly. If the terminal gets garbage data, check the speeds of the host and remote multiplexers, the terminal and the computer ports to make sure they match. Blocks of data are lost most often when data is sent to a printer or a lot of data is being displayed on a terminal. Most of these problems are due to flow control not matching between the printer or terminal and the multiplexer. If terminals and printers work for a while and then hang, check the flow control settings. When Xon/Xoff flow control is set to a different parity on the multiplexer than on the terminal or printer, the result is either a hung device that is flow controlled off but never back on, or a device that is never flowed off causing buffer overflow and lost data..6 Assistance If you need assistance troubleshooting your system, contact DCB customer support at (21) 9-6600 between :00 am and :00 pm central time Monday through Friday. 2
. WARRANTY DCB multiplexers are warranted to be free of defects in materials and workmanship for two years. Data Comm for Business will repair or replace any equipment proven to be defective within the warranty period. All warranty work is F.O.B. Dewey, IL. This warranty is exclusive of abuse, misuse, accidental damage, acts of God or consequential damages, etc. DCB liability shall not exceed the original purchase price. All equipment returned for repair must be accompanied by a Returned Material Authorization (RMA) number. To receive an RMA number, call (21) 9-6600 between the hours of AM and PM central time. Equipment must be shipped prepaid to DCB and will be returned at DCB's expense. Ship returned items to: Data Comm for Business 299 CR 1000E Dewey, IL 610 Data Comm for Business, Inc. PO Box 629 Champaign, IL 6126-629 Tel (21) 9-6600 Fax (21) 9-11 Email support@dcbnet.com 2